Hide the group tree in Active X viewer

I Use CR9 for reports and CE standard to distribute reports via an IIS virtual folder.  Reports are called via asp.

the reports are called using the IIS folder path

http://servername/virtual directoryreportnam.rpt

I already add the string ?init=actx so that the reports are vieved in the activex viewer, not the default DHTML.  Because the reports are unmanaged and are viewed using the guest account the enterprise settings are not used so i cant use the enterpise settings to turn the group tree off.

I believe that is also possible to add another string to the report name so that it turns the group tree off, does anyone know what it is>

many thanks